change font size and move add and delete button in edit screens (#128)

closes #118
closes #119

Reviewed-on: #128

frontend/allowance-planner-v2/src/app/pages/edit-allowance/edit-allowance.page.scss

@@ -4,10 +4,8 @@
 }
 
 .remove-button {
-    background-color: var(--ion-color-primary);
-    margin-right: 15px;
-    width: 100px;
-    margin-bottom: 0;
+    margin-top: 10px;
+    background-color: var(--negative-amount-color);
 }
 
 form {
@@ -47,8 +45,7 @@ button {
     color: white;
     padding: 10px;
     width: 250px;
-    margin-top: auto;
-    margin-bottom: 50px;
+    margin-top: 100px;
 }
 
 button:disabled,